package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.apache.xmlbeans.impl.jam.mutable.MMethod;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

/*
* 自定义切面类,统一拦截,进行公共字段填充
* */
@Component
@Aspect
@Slf4j
public class AutoFillAspect {
    /*
    * 切入点表达式
    * */
    @Pointcut("execution(* com.sky.mapper.*.*(..))&&@annotation(com.sky.annotation.AutoFill)")
    public void autoFillPointCut(){}
    /*
    *前置通知,进行公共字段赋值
    * */
    @Before("autoFillPointCut()")
    public void autoFill(JoinPoint joinPoint){
        log.info("开始进行公共字段填充");
        //获取当前方法被拦截的数据库操作类型
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();//方法签名对象
       AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获得方法上的注解对象
         OperationType operationtype = autoFill.value();//获得数据库操作类型
        //获取当前被拦截方法的参数-实体对象
        Object[] args = joinPoint.getArgs();
          if(args==null||args.length==0){
              return;
          }
        Object entity = args[0];
        //准备要填充的数据
        LocalDateTime now=LocalDateTime.now();
        Long currentId= BaseContext.getCurrentId();
        //根据当前不同操作类型,通过反射为不同属性赋值
        if(operationtype==OperationType.INSERT){
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                setUpdateUser.invoke(entity,currentId);
                setUpdateTime.invoke(entity,now);
                setCreateTime.invoke(entity,now);
                setCreateUser.invoke(entity,currentId);

            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        } else if (operationtype==OperationType.UPDATE) {
            try {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                setUpdateUser.invoke(entity,currentId);
                setUpdateTime.invoke(entity,now);

            } catch (Exception e) {
                throw new RuntimeException(e);
            }
        }
    }
}
